The Great White Queen by William le Queux

TWELVE days later I found myself accompanying Kona who, at the head of a great force of over eighteen thousand men, was crossing the treacherous quicksands by the Way of the Thousand Steps. The critical position of Mo had been fully discussed by Omar, his officers and sages, and it had been decided to send, in addition to the force of twenty thousand men to the Hombori Mountains on the northern frontier, a second expedition to travel with all swiftness across the sandy plain and make a dash upon Samory's stronghold at Koussan in the absence of its picked troops.

Within two days after Makhana had brought news of the coming invasion, the whole of the twenty thousand men, with Omar himself at their head, had marched out of the capital on their way to defend the pass. I had expressed a wish to accompany them, but my friend had requested me to go with the expedition to Samory's capital because, having been there in captivity, I could act as guide. To this I made no objection, and bidding farewell to Omar, Goliba and Niaro at the city gate, I had watched them ride away at the head of a brilliant cavalcade, and the same evening at sundown descended the face of the cliff by the long flight of steps, and jumping into the saddle of a horse held ready for me, rode with all haste to catch up Kona who, as leader of our expedition, had already started for the gigantic precipice known as the Gate of Mo.